Going on win percentage, Mourinho is United best manager up to EtH with a 58% win rate in all competitions. Solksjaer is close behind with a win rate of 53% in all competitions.
The BEST by a long shot, (so far) is EtH, P79 W49. D9 L21 GPGF 1.67 GPGA 1.18 with a win rate of 62% in all competitions.
So compared to the likes of Moyes, Van Gaal and Rangnik, Olé was a good manager !
As for you comment about man management, (ignore Greenwood, because he basically had nothing to do with that, it's been awful, he's failed to solve anything that has come his way, his only way of dealing with it, is to ignore it, and hope it will go away!
His stand against Sancho is costing the club £5m in wages !
From what I've read and heard about, there are very few players in the squad he hasn't fallen out with.
I'd also debate whether is was him that actually said he wanted a particular player, or even named them, Antony probably being the major exception, you only have to look at the Fellani purchase to know that the previous board went with what was available rather than what was needed.